Tania Head’s story, as shared over the years with reporters, students, friends and hundreds of visitors to ground zero, was a remarkable account of both life and death.

She had, she said, survived the terror attack on the World Trade Center despite having been badly burned when the plane crashed into the upper floors of the south tower....

Much of Ms. Head’s account was posted on the Web site of the World Trade Center Survivors’ Network, a nonprofit organization for which she served as president and as point person for corporate donations.

But no part of her story, it turns out, has been verified.